chore: clean up repo for public release

- Remove BMAD framework, IDE configs, dev screenshots, test files,
  internal docs, and backup files
- Rename keep-notes/ to memento-note/
- Update all references from keep-notes to memento-note
- Add Apache 2.0 license with Commons Clause (non-commercial restriction)
- Add clean .gitignore and .env.docker.example

mcp-server/n8n-workflow-email-integration.json

@@ -181,7 +181,7 @@
     },
     {
       "parameters": {
-        "channel": "keep-notes-sync",
+        "channel": "memento-note-sync",
         "text": "📧 New email saved to Keep Notes:\n\n**{{ $json.title }}**\n\nLabels: {{ $json.labels.join(', ') }}\nColor: {{ $json.color }}\n\nView: http://localhost:3000"
       },
       "id": "notify-slack",
@@ -297,7 +297,7 @@
   "tags": [
     {
       "createdAt": "2026-01-18T00:00:00.000Z",
-      "id": "keep-notes-integrations",
+      "id": "memento-note-integrations",
       "name": "Keep Notes Integrations"
     }
   ],